We consider the spin-1/2 anisotropic XY chain in a transverse (z) field with the Dzyaloshinskii-Moriya interaction directed along z-axis in spin space to examine the effect of the Dzyaloshinskii-Moriya interaction on the zz, xx and yy dynamic structure factors. Using the Jordan-Wigner fermionization approach we analytically calculate the dynamic transverse spin structure factor. It is governed by a two-fermion excitation continuum. We analyze the effect of the Dzyaloshinskii-Moriya interaction on the two-fermion excitation continuum. Other dynamic structure factors which are governed by many-fermion excitations are calculated numerically. We discuss how the Dzyaloshinskii-Moriya interaction manifests itself in the dynamic properties of the quantum spin chain at various fields and temperatures.
@article{arxiv.0712.3361,
title = {Dynamic probes of quantum spin chains with the Dzyaloshinskii-Moriya interaction},
author = {Oleg Derzhko and Taras Verkholyak and Taras Krokhmalskii and Helmut Büttner},
journal= {arXiv preprint arXiv:0712.3361},
year = {2007}
}